Thank you! Seems like there are both positive small studies and self-reported anecdata available

https://reddit.com/r/covidlonghaulers/s/2SzkM5ca5K

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9250701/

That "study" doesn't even have a control but, then again, I wouldn't expect much from research around long covid.

Really hard to get proper funding for LDN. It is an already incredibly cheap drug in a minute dose... this treatment is not exciting to anyone except patients and a few passionate researchers.

Lots of studies showing "interesting results, needs more investigation" but high quality studies are very slow to come...